[sdiy] CEM3340 question

Werner Flügel werner.fluegel at b-tu.de
Thu Dec 3 10:57:17 CET 2020

Am 03.12.2020 um 10:29 schrieb Joel B:
> The Behringer Neutron uses two 3340s but it has a feature that I’m not seeing in the CEM3340 data sheet - voltage controlled wave shape - you can sweep between four different shapes. It’s a little glitchy unless you modulate at a fairly low frequency. Yet when I look at what is available otherwise, especially in Eurorack format using this chip, nothing has that feature.
> How did Behringer implement that?

I don't know how Behringer did that, but I assume that it's not a part 
of the 3340. I remember a circuit Juergen Haible used, an interpolating 
scanner, for sweeping between four filter outputs (a 2240 clone and an 
Oberheim SEM-VCF IIRC). Unfortunately the legacy sites (jhaible.com and 
jhaible.info) doesn't have the files, both bring a 404 error for the 
JH4, which had that circuit.



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